<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
    <script>
      const person = {
        name: 'jack',
        age: 20,
        lang: ['java', 'js', 'python']
      }

      console.log(Object.keys(person))
      console.log(Object.values(person))
      console.log(Object.entries(person))
    </script>
	</body>
</html>
